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CONTENTS

PAGE
PREFACE.........                     »      ,      v
SCHEME OF THE CLASSIFICATION ADOPTED IN THIS BOOK                     «      .     ix
CHAPTER  I
INTRODUCTORY.......,                                    1
UITAPTEB  II
STRUCTURE AND PRESENT DISTRIBUTION OF THE MAMMALIA                            5
OIIAPTEB  III
THE POSSIBLE FORERUNNERS OF THE MAMMALIA       .      .      .      .      .90
CHAPTER  IV
THE DAWN OF MAMMALIAN LIFE........96
OITAPTEB V
THE EXISTING ORDERS OP MAMMALS: PKOTOTiiEnu—MONOTREMATA       •   105
CHAPTER VI
INTRODUCTION TO THE SUB-CLASS EUTHISRIA      „      ,      ,      .      »      .116
CHAPTER VII
EUTHERIA-- MARSUPIALIA    *.*,,«*•«.   122